Directed Electronics A1200/4 - Manual (Page 26)

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TC-X CROSSOVER
Your new amplifier has a TC-X Crossover (Total Control X-over ® )
30Hz-4kHz (see this guide for Crossover Chart).12dB per octave
phase correlated crossover built-in to provide superior system
flexibility without the added expense and installation of an outboard
crossover. The speaker outputs of your amplifier are high pass, low
pass, or all-pass according to the HP/LP/FULL switch on the front
endplate. You would choose low pass (middle position of switch) to
use this amplifier for subwoofers, choose high pass (left position of
switch), or full (right position of switch) to use this amplifier for full
range speakers.
The RCA outputs are controlled by a separate HP/LP/FULL switch,
and are always independent of the speaker output crossover. As
well as being able to independently select HP/LP/FULL, your new
amplifier allows independent selection of frequencies from 30Hz-
4kHz (see Crossover Detent Chart in this guide).
A600/4, A1200/4
Front - 12dB/Octave, Detented High Pass 30Hz-4kHz
Rear - 12dB/Octave, Detented High Pass; HP/LP/FULL
RCA Outputs - 12dB/Octave, Detented High Pass; HP/LP/FULL
QBASS PLUS TM - on Rear Channel - up to 18dB @ 30, 36, 44, 60Hz